Brezhneva Olena H.. Theory and Practice of Mathematical Development of 3-6 Years Old Children in Preschool Education System : Доктор педагогічних наук : spec.. 13.00.08 - Дошкільна педагогіка : presented. 2019-03-26; popup.evolution: .; Institute of Problems on Education of the National Academy of Educational science of Ukraine. – Київ, 0519U000251.

Updated: 2026-11-09